Question

A certain metal salt solution is electrolysed in series with a silver coulometer. The weight of silver and the metal deposited are $0.5094$ g and $0.2653$ g. Calculate the valency of the metal if its atomic weight is nearly that of silver.

• A. $1$
• B. $2$
• C. $3$
• D. $4$

Answer 1

Answer: (B)

$2$

$\frac{w_1}{w_2}=\frac{(E_1{)}_{Ag}}{(E_2{)}_{metal}}\frac{0.5094}{0.2653}=\frac{(\frac{at.}{v.f.}{)}_{Ag}}{(\frac{at.}{v.f.}{)}_{metal}}$
$\frac{0.5094}{0.2653}=\frac{(v.f{)}_{Ag}}{1}v.f.=1.9\approx 2$